Hand-held oscillating tool

Abstract

The utility model relates to a handheld swing tool, is matched with working element, the handheld swing tool includes the casing, installs motor assembly of the casing, the drive mechanism connected in the motor assembly and the output shaft driven by the drive mechanism, the working element is fixed in the output shaft, the casing includes the outer casing for user holding, the motor casing of containing the motor assembly and the head shell fixed in the motor casing, the head shell contains the drive mechanism and the output shaft, the handheld swing tool includes the first damping unit connected between the outer casing and the motor casing and the second damping unit connected between the outer casing and the head shell, and the hardness of first damping unit is higher than the hardness of second damping unit, the handheld swing tool of the utility model is small and comfortable with vibration.

Description

[Technical Field]

[0001] This utility model relates to the field of power tool technology, and in particular to a handheld swing tool used in decoration, construction and other occasions. [Background Technology]

[0002] A multi-functional saw, also known as a "jack-of-all-trades," is a handheld swing tool named for its versatility and wide range of applications. Equipped with a saw blade, it uses an eccentric shaft connected to a motor to drive an output shaft that swings left and right for operation. Depending on the type of saw blade, it can be used for cutting, grinding, scraping, and cleaning grout lines. Multi-functional saws are widely used in home improvement, furniture making, carpentry, electrical work, and pipe installation, and can operate in confined spaces or awkward corners.

[0003] The working principle of a multi-functional machine is to use the eccentric shaft's oscillating motion to drive the lever and output shaft to swing left and right. However, when the saw blade is installed on the output shaft, the center of gravity of the saw blade and the output shaft often deviates from the oscillation axis, causing the multi-functional machine to move eccentrically. This results in significant vibration during operation, making it difficult for the operator to hold the machine stably, thus affecting the processing effect of the workpiece. On the other hand, the excessive vibration makes the operator feel very tired after working for a period of time, thereby affecting work efficiency.

[0004] Therefore, it is indeed necessary to provide an improved handheld swing tool to overcome the shortcomings of the existing technology. [Utility Model Content]

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a handheld swing tool with low vibration and high comfort.

[0006] The present invention solves the existing technical problems by adopting the following technical solution: A handheld swing tool, adapted with a working element, the handheld swing tool includes a housing, a motor assembly mounted on the housing, a drive mechanism connected to the motor assembly, and an output shaft driven by the drive mechanism, the working element being fixed to the output shaft, the housing including an outer housing for the user to hold, a motor housing housing the motor assembly, and a head housing fixed to the motor housing, the head housing housing the drive mechanism and the output shaft; the handheld swing tool includes a first vibration damping unit connected between the outer housing and the motor housing, and a second vibration damping unit connected between the outer housing and the head housing, the first vibration damping unit having a higher hardness than the second vibration damping unit.

[0007] A further improvement is that the ratio of the hardness of the second damping unit to that of the first damping unit is 0.3 to 0.7.

[0008] A further improvement is as follows: the first vibration damping unit is configured to separate the motor housing and the outer housing. The first vibration damping unit includes a pair of first vibration damping pads. The outer housing includes a mounting cavity formed on the inner wall. The first vibration damping pads are housed in the mounting cavity and abut against the motor housing.

[0009] A further improvement is as follows: the second vibration damping unit is configured to separate the head shell and the outer casing. The second vibration damping unit includes a pair of second vibration damping pads. The outer casing includes a mounting cavity formed on the inner wall. The head shell includes a positioning post protruding from the outer surface. The second vibration damping pad includes a recessed positioning hole. The second vibration damping pad is received in the mounting cavity, and the second vibration damping pad is sleeved on the positioning post through the positioning hole.

[0010] A further improvement is as follows: the second vibration damping unit includes a pair of third vibration damping pads, which are glued to the inner wall of the outer casing and abut against the head shell.

[0011] A further improvement is that the second and third vibration damping pads are arranged at intervals in the vertical direction.

[0012] A further improvement is as follows: a pair of second damping pads are arranged symmetrically about the axis of the motor assembly, and a pair of third damping pads are arranged symmetrically about the axis of the output shaft.

[0013] A further improvement is as follows: a pair of the first damping pads are arranged symmetrically about the axis of the motor assembly, and the first damping pads are disposed on the side of the motor housing away from the head shell.

[0014] A further improvement is that the centers of a pair of first damping pads and a pair of second damping pads are located on the same horizontal plane.

[0015] A further improvement is as follows: the axis of the motor assembly is perpendicular to the axis of the output shaft, and the axis of the motor assembly and the axis of the output shaft together form a central plane. A pair of first damping pads, a pair of second damping pads, and a pair of third damping pads are all arranged symmetrically about the central plane.

[0016] Compared with the prior art, the present invention has the following advantages: by separating the inner and outer housings through the vibration damping unit, it is beneficial to prevent the vibration generated by the handheld swing tool in the working state from being transmitted to the outer housing through the inner housing, thereby reducing the vibration of the grip area and improving the user's operating comfort. [Attached Image Description]

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the structure of the handheld swing tool of this utility model;

[0019] Figure 2 yes Figure 1 An exploded view of the handheld swing tool shown.

[0020] Figure 3 yes Figure 2 A schematic diagram of the inner housing and vibration damping unit in a handheld swing tool;

[0021] Figure 4 yes Figure 2 An exploded view of the main components of the handheld swing tool shown.

[0022] Figure 5 yes Figure 4 The diagram shows the structure of the end cap of the handheld swing tool.

[0023] Figure 6 yes Figure 4 A schematic diagram of the eccentric shaft in the handheld swing tool shown;

[0024] Figure 7 yes Figure 2 The diagram shows the connection between the motor housing and the first vibration damping unit in the handheld swing tool.

[0025] Figure 8 yes Figure 2 The diagram shows the connection between the head shell and the second vibration damping unit in the handheld swing tool.

[0026] Figure 9 yes Figure 2 The diagram shows the connection between the head shell and the third vibration damping unit in the handheld swing tool.

[0027] Figure 10 yes Figure 2 A sectional schematic diagram of the drive mechanism and output shaft in the handheld swing tool shown.

[0028] Figure 11 yes Figure 10 Enlarged view of center circle A;

[0029] Figure 12 yes Figure 4 The diagram shows the structure of the clamping sleeve in the handheld swing tool.

[0030] Figure 13 yes Figure 4 The diagram shows the structure of the support component in the handheld swing tool.

Detailed Implementation Methods

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0032] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right," which indicate orientation or positional relationship, are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0033] Please see Figure 1 As shown, the embodiment of this utility model relates to a handheld swing tool 100, which is widely used in decoration, construction, carpentry, electrical work, pipe installation and other fields. The handheld swing tool 100 is adapted to be equipped with a working element 101, which can be a saw blade. Depending on the type of saw blade, the user can perform various operations such as cutting, grinding, scraping, and cleaning brick joints.

[0034] Please see Figures 2 to 4 As shown, the handheld swing tool 100 includes a housing 1, a motor assembly 2 mounted on the housing 1, a drive mechanism 3 connected to the front end of the motor assembly 2, an output shaft 4 driven by the drive mechanism 3, a fastening element 6 mounted on the output shaft 4, and a locking mechanism 5 that locks the fastening element 6 into the output shaft 4. The fastening element 6 is inserted into the output shaft 4, and the working element 101 is fixed to the output shaft 4 by the locking mechanism 5. The output shaft 4 drives the working element 101 to swing back and forth within a predetermined angle range around the axis L3 of the output shaft 4.

[0035] In this embodiment, the aforementioned housing 1 includes an outer housing 11 for the user to hold and an inner housing that houses the motor assembly 2, the drive mechanism 3, and the output shaft 4. The outer housing 11 covers the inner housing, so that the inner housing is hidden inside the outer housing 11 and is not easily touched by the user. Furthermore, the inner housing includes a motor housing 12 that houses the motor assembly 2 and a head housing 13 that houses the drive mechanism 3 and the output shaft 4. The head housing 13 is fixed to the front end of the motor housing 12, and the lower end of the output shaft 4 is at least partially exposed to the head housing 13 and the outer housing 11 to facilitate the user's disassembly and assembly of the working element 101.

[0036] In this embodiment, the outer casing 11 is made of a plastic material, while the inner casing is made of a metal material. Furthermore, a soft material such as a rubber coating can be applied to the outer surface of the outer casing 11 to make it comfortable for the user to hold.

[0037] Please combine Figure 1 and Figure 2 As shown, the aforementioned outer casing 11 includes a gripping area 111 for a user to hold, a first functional area 112 connected to the front end of the gripping area 111, a second functional area 113 connected to the front end of the first functional area 112, and a battery pack mounting portion 114 connected to the rear end of the gripping area 111. The first functional area 112 corresponds to the position of the motor housing 12, and the second functional area 113 corresponds to the position of the head housing 13. The battery pack mounting portion 114 is configured to mount a battery pack (not shown) to power the motor assembly 2 via the battery pack. Preferably, the battery pack is detachably connected to the battery pack mounting portion 114, and the battery pack is installed and released relative to the battery pack mounting portion 114 via a button provided on the battery pack.

[0038] Optionally, the nominal voltage of the battery pack can be greater than or equal to 10V and less than or equal to 20V. For example, the nominal voltage of the battery pack can be 12V, 18V, 20V, etc. Optionally, the nominal voltage of the battery pack can be greater than 20V and less than or equal to 100V. For example, the nominal voltage of the battery pack can be 24V, 40V, 56V, 80V, etc.

[0039] Furthermore, since no other components need to be installed in the grip area 111, the diameter of the grip area 111 is set to be smaller than the diameter of the first functional area 112, so that the user can grip it comfortably.

[0040] Furthermore, a control component can be installed at the battery pack mounting section 114. The control component is electrically connected to the motor assembly 2 and controls the motor assembly 2.

[0041] Please see Figure 2 As shown, the outer casing 11 is composed of two symmetrical half-shells, which are fixed together by screws.

[0042] Please see Figure 4 As shown, the motor assembly 2 includes a stator 21 and a rotor 22 connected to each other, and front bearings 23 and rear bearings 24 on the front and rear sides of a rotor shaft 221 supporting the rotor 22. The motor assembly 2 has a first axis L1 extending in the front-rear direction, and the output shaft 4 has a third axis L3 extending in the vertical direction. The first axis L1 is substantially perpendicular to the third axis L3. Preferably, the first axis L1 and the third axis L3 are coplanar and together form a central plane; alternatively, the first axis L1 and the third axis L3 may not be coplanar, or may be coplanar but not perpendicular.

[0043] Please combine Figure 4 and Figure 5As shown, the motor housing 12 includes a motor bracket 121 for housing the motor assembly 2 and an end cover 122 mounted on the rear end of the motor bracket 121. The stator 21 and the rotor 22 are both housed in the motor bracket 121. The front end of the motor bracket 121 has a through opening 123. The rotor shaft 221 extends through the opening 123 to connect with the drive mechanism 3. The end cover 122 is used to at least partially close the motor bracket 121 from the rear end, and the rear bearing 24 is mounted on the end cover 122.

[0044] In this embodiment, the end cap 122 includes a cover body 1221, a bearing chamber 1222 recessed in the cover body 1221, and a plurality of claws 1223 protruding from the outer periphery of the cover body 1221 toward the motor bracket 121. The rear bearing 24 is installed in the bearing chamber 1222, and the end cap 122 is connected to the motor bracket 121 via the plurality of claws 1223.

[0045] Please combine Figure 4 and Figure 10 As shown, the drive mechanism 3 is configured to convert the rotational motion of the motor assembly 2 around the first axis L1 into a reciprocating rotational motion of the output shaft 4 around the third axis L3. Specifically, the drive mechanism 3 includes an eccentric shaft 31 connected to the front end of the motor assembly 2, a shift fork 33 connected to the front end of the eccentric shaft 31, and an eccentric bearing 32 connected between the eccentric shaft 31 and the shift fork 33. The shift fork 33 drives the output shaft 4 to move. The shift fork 33 includes a sleeve fitted around the outer periphery of the output shaft 4 and a pair of fork-shaped portions extending from the sleeve toward the eccentric shaft 31. The pair of fork-shaped portions of the shift fork 33 cooperate with the eccentric bearing 32, and the pair of fork-shaped portions of the shift fork 33 are fitted on both sides of the eccentric bearing 32 so that the fork-shaped portions are in close sliding contact with the outer surface of the eccentric bearing 32. The eccentric bearing 32 is a ball bearing and has a spherical outer surface that cooperates with the fork-shaped portions.

[0046] Please see Figure 6 As shown, the eccentric shaft 31 includes a connecting portion 311 connected to the rotor shaft 221 of the motor assembly 2, an eccentric portion 312 fixed to the front end of the connecting portion 311, and a balance block 313 installed on the connecting portion 311. The front bearing 23 is sleeved on the outer periphery of the connecting portion 311. The connecting portion 311 and the rotor shaft 221 are coaxially arranged on the first axis L1, while the eccentric portion 312 has a second axis L2 that does not coincide with the first axis L1 and is radially offset by a certain distance, so that the eccentric portion 312 is eccentrically connected to the motor assembly 2.

[0047] In this embodiment, the aforementioned balance block 313 is configured to balance the weight of the eccentric portion 312, thereby reducing the vibration of the handheld swing tool 100. This reduces the likelihood of hand numbness when using the handheld swing tool 100, resulting in a better user experience. Furthermore, relative to the first axis L1, the balance between the balance block 313 and the eccentric portion 312 tends to be zero or equal to zero.

[0048] The working principle of the handheld swing tool 100 is as follows: the motor assembly 2 drives the rotor shaft 221 to rotate under the power of the battery pack. The eccentric part 312 of the eccentric shaft 31 rotates eccentrically relative to the first axis L1 of the motor assembly 2, thereby driving the eccentric bearing 32 to rotate eccentrically relative to the first axis L1 of the motor assembly 2. Under the drive of the eccentric bearing 32, the shift fork 33 swings back and forth relative to the third axis L3 of the output shaft 4, thereby driving the output shaft 4 and the working element 101 fixed on the output shaft 4 to swing back and forth around the third axis L3.

[0049] Combination Figure 3 , Figure 4 and Figure 10 As shown, the output shaft 4 is rotatably connected to the head housing 13 via the lower bearing 46, so that the output shaft 4 does not directly contact the head housing 13, thus preventing collision and wear between the two.

[0050] The output shaft 4 is generally cylindrical and has a tubular shaft body 41, an open end 42 located on the upper end side of the shaft body 41, a stepped end 43 located on the lower end side of the shaft body 41, and a journal 44 extending from the stepped end 43 toward the working element 101.

[0051] Specifically, the open end 42 has no solid structure and has a large diameter, which facilitates the assembly of parts from the open end 42; while the stepped end 43 has a partially closed bottom for supporting parts installed in the shaft body 41.

[0052] Optionally, the journal 44 is configured to mount the tool holder 102. The outer diameter of the journal 44 is smaller than the outer diameter of the shaft body 41. The tool holder 102 is press-fitted to the outer periphery of the journal 44 so that the working element 101 is clamped between the tool holder 102 and the fastening element 6 to prevent the working element 101 from shaking.

[0053] Please see Figure 4 and Figure 10As shown, the fastening element 6 has a shaft end 61 installed in the locking mechanism 5, a fastening flange 64 for fixing the working element 101, a spindle 62 extending from the fastening flange 64 along the axial direction of the output shaft 4, and a relief groove 63 recessed downward from the fastening flange 62. The shaft end 61, spindle 62, fastening flange 64 and relief groove 63 are integrally constructed. The shaft end 61 and spindle 62 pass through the central hole of the working element 101. The fastening flange 64 abuts against the lower end face of the working element 101 and presses the upper end face of the working element 101 toward the tool holder 102. After the shaft end 61 is clamped by the locking mechanism 5, the movement of the fastening element 6 in the vertical direction is restricted, thereby making the working element 101 immovably located between the tool holder 102 and the fastening flange, thus completing the clamping of the working element 101.

[0054] The outer periphery of the fastening flange 64 may be provided with a knurled anti-slip structure to facilitate the pulling out and insertion of the fastening element 6.

[0055] Combination Figure 11 As shown, the locking mechanism 5 of the handheld swing tool 100 is mainly located inside the output shaft 4, with its upper end protruding upward to the outside of the output shaft 4. The upper end of the locking mechanism 5 is connected to the head shell 13 through the upper bearing 45 to prevent the locking mechanism 5 from directly contacting the head shell 13 and avoid wear.

[0056] The locking mechanism 5 includes a retaining sleeve 51, a clamping sleeve 52, and an intermediate frame 53 installed inside the output shaft 4; an elastic element 56 sleeved on the outer periphery of the intermediate frame 53; a support element 55 connected to the output shaft 4; a movable element 54 movably installed inside the support element 55; a damping element 58 sleeved on the outer periphery of the movable element 54; and a limiting element 57 installed on the outer periphery of the fastening element 6. The locking mechanism 5 achieves locking and releasing of the fastening element 6 through the combined action of the retaining sleeve 51, clamping sleeve 52, intermediate frame 53, movable element 54, support element 55, elastic element 56, limiting element 57, and damping element 58.

[0057] The locking mechanism 5 has a locked state and a released state. When the locking mechanism 5 is in the locked state, the clamping sleeve 52 and the shaft end 61 are tightly connected, and the fastening element 6 cannot be moved downwards or pulled out. When the locking mechanism 5 is in the released state, the clamping sleeve 52 and the shaft end 61 are loosely connected, and the fastening element 6 can be pulled out or inserted. After the fastening element 6 is operated to overcome the constraint force of the clamping sleeve 52, it can move downwards until it is away from the journal 44 of the output shaft 4, thereby replacing or disassembling the working element 101.

[0058] In this embodiment, the retaining sleeve 51 is disposed in the shaft body 41 with clearance fit. The retaining sleeve 51 has a hollow structure and its internal cavity can accommodate the clamping sleeve 52.

[0059] Specifically, the retaining sleeve 51 has a first receiving cavity 511 and a second receiving cavity 512, and a stop end 513 connected to the second receiving cavity 512. The inner peripheral wall of the first receiving cavity 511 is cylindrical, and its inner diameter is larger than the outer diameter of the clamping sleeve 52, so that the clamping sleeve 52 can expand radially within the first receiving cavity 511. The inner peripheral wall of the second receiving cavity 512 is frustoconical, and its inner diameter is smaller than the inner diameter of the first receiving cavity 511. Furthermore, the inner diameter of the second receiving cavity 512 gradually decreases in the direction away from the first receiving cavity 511, so that the clamping sleeve 52 can be locked within the second receiving cavity 512. In other words, the clamping sleeve 52 cannot expand radially within the second receiving cavity 512, or its radial expansion range is very small and negligible.

[0060] The first receiving cavity 511 and the second receiving cavity 512 provide radial limiting for the clamping sleeve 52, allowing the clamping sleeve 52 to lock or release the shaft end 61. The frustum-shaped inner wall of the second receiving cavity 512 allows the clamping sleeve 52 to be better engaged. There is line contact between the second receiving cavity 512 and the clamping sleeve 52, resulting in a stable and reliable locking effect. Furthermore, if there is a dimensional error in the shaft end 61 and / or the clamping sleeve 52, the second receiving cavity 512 can still lock the clamping sleeve 52.

[0061] The stop end 513 is used to axially limit the clamping sleeve 52. The clamping sleeve 52 can be inserted into the retaining sleeve 51 from top to bottom. The stop end 513 restricts the clamping sleeve 52 from disengaging from the retaining sleeve 51 from below. The inner diameter of the stop end 513 is smaller than the minimum outer diameter of the retaining sleeve 51.

[0062] In this embodiment, when the locking mechanism 5 is in the locked state, at least part of the clamping sleeve 52 is received in the second receiving cavity 512, the second receiving cavity 512 radially locks the clamping sleeve 52, and the lower end of the clamping sleeve 52 can abut against the stop end 513; when the locking mechanism 5 is in the released state, the clamping sleeve 52 moves upward relative to the stop end 513, the clamping sleeve 52 leaves the area of ​​the second receiving cavity 512, and there is a certain gap between the clamping sleeve 52 and the stop end 513, the gap being greater than or equal to the height of the second receiving cavity 512, so that the radial space in which the clamping sleeve 52 can move within the first receiving cavity 511 becomes larger.

[0063] Combination Figure 12 As shown, the clamping sleeve 52 has a plurality of jaws 521, a retainer 522 sleeved on the outer periphery of the jaws 521, and a retainer groove 524 recessed from the outer periphery of the jaws 521. The retainer 522 is received in the retainer groove 524 and is made of an elastic material. It is configured to retain the plurality of jaws 521 so that the plurality of jaws 521 are kept in a close-to-each-other state.

[0064] In this embodiment, there are two grippers 521, and the two grippers 521 close together to hold the shaft end 61.

[0065] Specifically, the aforementioned grippers 521 can close or separate, and the plurality of grippers 521 surround to form a shaft end receiving cavity 52a, the shape of which is adapted to the shaft end 61. The retainer 522 drives the plurality of grippers 521 to remain close to each other, at which time the shaft end 61 and the grippers 521 are in contact with each other; when the fastening element 6 is operated, the shaft end 61 can drive the grippers 521 to overcome the restraining force of the retainer 522 and temporarily separate. Further, in response to the insertion and / or removal of the fastening element 6, the grippers 521 move outward in the radial direction, and the retainer 522 is stretched; after the fastening element 6 is disengaged from the clamping sleeve 52, in response to the rebound force of the retainer 522, the plurality of grippers 521 continue to move closer to each other.

[0066] Preferably, each gripper 521 defines a protrusion and a recess of an interlocking structure. Adjacent grippers 521 are interlocked by the combination of their respective interlocking structures, allowing the grippers to move radially relative to each other and guiding this radial movement. At the same time, it also restricts the axial movement of the grippers 521 relative to each other, making the assembly and positioning of the grippers 521 more accurate and preventing misalignment between multiple grippers 521.

[0067] In this embodiment, the shaft end 61 has a first shaft end portion 611, a second shaft end portion 612, and a third shaft end portion 613. The sidewall of the first shaft end portion 611 is tapered, which is mainly used to guide the fastening element 6 during insertion and reduce the resistance during insertion. The second shaft end portion 612 has a relatively large diameter, and the diameter of the second shaft end portion 612 is greater than the maximum diameter of the third shaft end portion 613, which is mainly used for limiting. The third shaft end portion 613 gradually narrows in the direction toward the working element 101. The third shaft end portion 613 mainly plays a guiding and limiting role, guiding the fastening element 6 when it is pulled out, and improving the smoothness of the pull-out.

[0068] Furthermore, the shaft end receiving cavity 52a has a limiting groove 523 that abuts against the third shaft end portion 613, a shaft end receiving groove 525 that receives the first shaft end portion 611 and the second shaft end portion 612, a mandrel receiving groove 526 that receives the mandrel 62, and an intermediate frame receiving groove 527 that is recessed upward from the end of the gripper 521. The shaft end receiving cavity 52a is mainly used to cooperate with the fastening element 6 and the intermediate frame 53.

[0069] The shaft end receiving groove 525 has a gap between itself and the first shaft end portion 611 and the second shaft end portion 612, reducing the frictional force of the fastening element 6 being pulled out. The side wall of the limiting groove 523 fits against the third shaft end portion 613, thereby restricting the axial movement of the third shaft end portion 613. The shape of the third shaft end portion 613 and the limiting groove 523 are adapted so that the limiting groove 523 applies a clamping force to the third shaft end portion 613, and the direction of the clamping force intersects with the extension direction of the output shaft 4, making the fit between the two tighter. The lower end of the second shaft end portion 612 and the third shaft end portion 613 are used to push the gripper 521, causing the retainer 522 to be stretched and the multiple grippers 521 to disengage from each other. The spindle receiving groove 526 can be clearance-fitted with the spindle 62. The inner diameter of the spindle receiving groove 526 is smaller than the minimum diameter of the third shaft end portion 613, thereby axially limiting the shaft end 61.

[0070] Preferably, the sidewall of the limiting groove 523 is in contact with the surface of the third shaft end portion 613, making the connection more reliable.

[0071] In this embodiment, the intermediate frame 53 has a hollow shaft tube 531 extending in the axial direction along the output shaft 4, a shaft wing 532 extending radially outward from the shaft tube 531, and a shaft foot 533 protruding upward from the shaft tube 531. The intermediate frame 53 is configured to support the clamping sleeve 52 and guide the movement of the elastic member 56.

[0072] One end of the elastic element 56 abuts against the retaining sleeve 51, and the other end abuts against the shaft wing 532. When the elastic element 56 is installed, it is in a pre-compressed state, which pushes the retaining sleeve 51 upward and presses the shaft wing 532 downward. The elastic element 56 presses against the shaft wing 532, thereby preventing the intermediate frame 53 from shaking within the output shaft 4, and the shaft tube 531 can guide the compression and rebound of the elastic element 56.

[0073] Specifically, the upper end of the shaft tube 531 is used to support the clamping sleeve 52 and restrict the axial movement of the clamping sleeve 52. The shaft foot 533 extends into the intermediate frame receiving groove 527 and restricts the radial tightening position of the clamping sleeve 52. That is, after the shaft end 61 is disengaged from the clamping sleeve 52, the shaft foot 533 supports the inner wall of the jaw 521 to prevent the retainer 522 from clamping the jaw 521 too tightly, which would be detrimental to the insertion of the fastening element 6.

[0074] When the locking mechanism 5 is in the locked state, there is an axial gap between the shaft tube 531 and the clamping sleeve 52; when the locking mechanism 5 is in the released state, the end of the shaft tube 531 abuts against the lower end of the clamping sleeve 52, and the inner wall of the clamping sleeve 52 abuts against the shaft foot 533, and the intermediate frame 53 limits the clamping sleeve 52 in the axial and radial directions.

[0075] Combination Figure 13As shown, the lower end of the support member 55 is installed inside the shaft body 41 of the output shaft 4, and the upper end is installed inside the head housing 13 through the upper bearing 45, thereby assembling components such as the retaining sleeve 51, clamping sleeve 52, intermediate frame 53 and elastic member 56 inside the output shaft 4.

[0076] The support member 55 has a support foot 551 connected to the shaft 41, a support shoulder 552 that extends radially outward from the support foot 551, a support neck 553 that extends upward from the support foot 551, and a moving guide groove 554 that passes through the support member 55. The support member 55 is mainly used to form an assembly connection with the output shaft 4.

[0077] Specifically, the support foot 551 is housed in the shaft body 41 and the two are interference-fitted; the support shoulder 552 abuts against the end of the shaft body 41 to position the support member 55 relative to the output shaft 4; the support neck 553 extends upward into the head shell 13 and is positioned and mounted by the upper bearing 45; the moving member guide groove 554 restricts and guides the moving member 54 to move up and down along the inner wall of the support member 55.

[0078] Please see Figure 4 , Figure 10 and Figure 11 As shown, the handheld swing tool 100 also includes an operating wrench 7 connected to the locking mechanism 5. By rotating the operating wrench 7, the fastening element 6 can be inserted into the output shaft 4 or pulled out of the output shaft 4.

[0079] The aforementioned operating wrench 7 is connected to the locking mechanism 5 and is configured to drive the moving member 54 to move along the axial direction of the output shaft 4. The operating wrench 7 has a shaft pin 71 fixed to the housing 1, a cam block 72 movably connected to the shaft pin 71, and a latch 73 mounted on the cam block 72. The latch 73 drives the cam block 72 to rotate around the shaft pin 71. The cam block 72 has a large-diameter portion and a small-diameter portion, with a gap between the small-diameter portion and the moving member 54. The large-diameter portion pushes the moving member 54 downwards.

[0080] In this embodiment, the upper end of the movable member 54 is adjacent to the cam block 72 and abuts against the support member 55, which positions the movable member 54; the lower end of the movable member 54 abuts against the retaining sleeve 51, indirectly positioning the retaining sleeve 51. The movable member 54 also has a clamping sleeve receiving groove 54a to provide movement space for the clamping sleeve 52.

[0081] Optionally, the damping element 58 abuts between the support element 55 and the moving element 54 to prevent them from colliding and generating unnecessary noise or vibration.

[0082] Optionally, the restraint 57 abuts between the journal 44 and the spindle 62 to prevent contact with the output shaft 4 and / or the intermediate frame 53, thus preventing collisions that could generate unnecessary noise or vibration.

[0083] In this embodiment, the installation steps of the locking mechanism 5 are as follows.

[0084] Step 1: The elastic element 56 is fitted onto the outer periphery of the intermediate frame 53, with the lower end of the elastic element 56 abutting against the intermediate frame 53, so that the elastic element 56 can be compressed and rebounded along the outer periphery of the intermediate frame 53 relative to the shaft wing 532 of the intermediate frame 53.

[0085] Step 2: Insert the intermediate frame 53 into the shaft body 41 from top to bottom through the opening end 42 of the output shaft 4 until the lower end face of the shaft wing 532 abuts against the stepped end 43.

[0086] Step 3: Then install the assembled clamping sleeve 52 into the retaining sleeve 51 until the clamping sleeve 52 abuts against the stop end 513;

[0087] Step 4: Install the retaining sleeve 51 inside the shaft body 41, and the retaining sleeve 51 is sleeved on the outer periphery of the intermediate frame 53 and abuts against the elastic member 56;

[0088] Step 5: Install the movable part 54 into the support part 55 from bottom to top;

[0089] Step 6: Press the support 55 into the open end 42 until the support 55 abuts against the upper end of the shaft 41.

[0090] The locking mechanism 5 can be assembled by following steps 1-6 above. The working element 101 can be replaced / disassembled / installed using the fastening element 6 and the operating wrench 7.

[0091] The principle of replacing the working element 101 is as follows: rotate the operating wrench 7 to release the locking mechanism 5 and remove the fastening element 6 from the output shaft 4. The specific process is as follows: with the shaft pin 71 as the axis of rotation, the lever 73 drives the cam block 72 to rotate at least 90°, so that the large diameter part of the cam block 72 abuts against the moving part 54, driving the moving part 54 to move downward, and driving the retaining sleeve 51 and the clamping sleeve 52 to move downward. When the retaining sleeve 51 moves downward, it biases the elastic element 56, so that the clamping sleeve 52 is located in the first receiving cavity 511 and the lower end of the clamping sleeve 52 abuts against the intermediate frame 53; pull the fastening element 6 downward along the axial direction of the output shaft 4, and the third shaft end part 613 and / or the second shaft end 612 push the multiple jaws 521 to move radially outward, and then the fastening element 6 disengages from the output shaft 4;

[0092] Replace working element 101;

[0093] Subsequently, the fastening element 6 is installed into the output shaft 4, and the operating wrench 7 is rotated to lock the locking mechanism 5. The specific process is as follows: the fastening element 6 is inserted into the shaft tube 531 of the intermediate frame 53, so that the shaft end 61 is inserted into the retaining sleeve 51. The lever 73 is rotated to drive the large diameter part to disengage from the moving part 54. The elastic element 56 pushes the retaining sleeve 51 upward until the stop end 513 abuts against the lower end of the clamping sleeve 52. The second receiving cavity applies a holding force to the clamping sleeve 52, thus completing the clamping of the working element 101.

[0094] Please see Figure 2 , Figure 3 , Figures 7 to 9 As shown, the aforementioned handheld swing tool 100 includes a vibration damping unit 8 connected between the outer housing 11 and the inner housing. The vibration damping unit 8 is configured to separate the inner housing and the outer housing 11. Since the motor assembly 2, the drive mechanism 3, and the output shaft 4 are all mounted in the inner housing, and the inner housing includes a motor housing 12 and a head housing 13 that are fixed to each other, the working components such as the motor assembly 2, the drive mechanism 3, and the output shaft 4 are integrated with the inner housing. The vibration damping unit 8 separates the inner housing and the outer housing 11, which helps to prevent the vibration generated by the handheld swing tool 100 in the working state from being transmitted to the outer housing 11 through the inner housing, reducing the vibration of the grip area 111, thereby improving the user's operating comfort.

[0095] In this embodiment, the vibration damping unit 8 includes a first vibration damping unit 81 disposed between the outer casing 11 and the motor casing 12, and a second vibration damping unit 82 and a third vibration damping unit 83 disposed between the outer casing 11 and the head casing 13. The first vibration damping unit 81 is the main vibration damping group, and the second and third vibration damping units 82 and 83 are auxiliary vibration damping groups. Therefore, when the first vibration damping unit 81 fails, the second and third vibration damping units 82 and 83 can also play an auxiliary vibration damping role.

[0096] In this embodiment, the first vibration damping unit 81 is the main vibration damping group, which has the main supporting and vibration damping functions. Therefore, the hardness of the first vibration damping unit 81 is higher than that of the second vibration damping unit 82 and the third vibration damping unit 83, while the second vibration damping unit 82 and the third vibration damping unit 83 have approximately the same hardness. Preferably, the ratio of the hardness of the second vibration damping unit 82 and the third vibration damping unit 83 to the hardness of the first vibration damping unit 81 is 0.3 to 0.7. More preferably, the ratio of the hardness of the second vibration damping unit 82 and the third vibration damping unit 83 to the hardness of the first vibration damping unit 81 is 0.4 to 0.6. More preferably, the ratio of the hardness of the second vibration damping unit 82 and the third vibration damping unit 83 to the hardness of the first vibration damping unit 81 is 0.45 to 0.55. More preferably, the ratio of the hardness of the second vibration damping unit 82 and the third vibration damping unit 83 to the hardness of the first vibration damping unit 81 is 0.5.

[0097] Please see Figure 2 and Figure 7 As shown, the first vibration damping unit 81 is configured to separate the motor housing 12 and the outer housing 11. The first vibration damping unit 81 is located on the side of the motor housing 12 away from the head housing 13, and the first vibration damping unit 81 includes a pair of first vibration damping pads. The first vibration damping pads are arranged in an arc shape and have a certain preload, so that a gap of 0.5mm-2mm is maintained between the motor housing 12 and the outer housing 11, thereby preventing collisions between the motor housing 12 and the outer housing 11 during operation, which would affect the vibration damping effect.

[0098] In this embodiment, the pair of first damping pads are arranged symmetrically about the first axis L1 of the motor assembly 2, and the pair of first damping pads are arranged symmetrically about the central plane.

[0099] In this embodiment, the outer casing 11 includes a mounting cavity 115 formed on the inner wall. The mounting cavity 115 is arranged in an arc shape to match the shape of the first damping pad. The first damping pad is housed in the mounting cavity 115 and abuts against the motor housing 12.

[0100] Please see Figure 2 and Figure 8 As shown, the second vibration damping unit 82 is configured to separate the head shell 13 and the outer casing 11. The second vibration damping unit 82 is located in the middle of the head shell 13 and includes a pair of second vibration damping pads. The second vibration damping pads are approximately elliptical in shape and have a certain preload, so that a gap of 0.5mm-2mm is maintained between the head shell 13 and the outer casing 11, thereby preventing collisions between the head shell 13 and the outer casing 11 during operation, which would affect the vibration damping effect.

[0101] In this embodiment, the thickness of the second damping pad is greater than the thickness of the first damping pad.

[0102] In this embodiment, the pair of second damping pads are arranged symmetrically about the first axis L1 of the motor assembly 2, and the pair of second damping pads are arranged symmetrically about the central plane.

[0103] In this embodiment, the outer casing 11 includes a mounting cavity 116 formed on the inner wall. The shape of the mounting cavity 116 matches the shape of the second damping pad. The head shell 13 includes a positioning post 131 protruding from the outer surface. The second damping pad includes a recessed positioning hole 821. The second damping pad is received in the mounting cavity 116 and is sleeved on the positioning post 131 through the positioning hole 821.

[0104] Please see Figure 3 As shown, the centers of a pair of first damping pads and a pair of second damping pads are located on the same horizontal plane to further enhance the damping effect of the damping unit 8.

[0105] Please see Figure 2 and Figure 9 As shown, the third vibration damping unit 83 is configured to separate the head housing 13 and the outer housing 11. The third vibration damping unit 83 is located at the lower end of the head housing 13 and close to the working element 101. The third vibration damping unit 83 includes a pair of third vibration damping pads, which are arranged in an arc shape and are spaced apart from the second vibration damping pad in the vertical direction. The third vibration damping pads are glued to the inner wall of the outer housing 11, and the inner side of the third vibration damping pads also abuts against the outer peripheral surface of the head housing 13. The third vibration damping pads are assembled without pre-pressure between the head housing 13 and the outer housing 11 to support the output shaft 4 and absorb the vibration generated by the high-frequency oscillation of the working element 101. At the same time, the third vibration damping pads also have a certain sealing effect, which can reduce the dust and fine particles generated during the operation from entering the interior of the handheld oscillating tool 100 through the housing of the working element 101, thereby improving the service life.

[0106] In this embodiment, the pair of third damping pads are arranged symmetrically about the third axis L3 of the output shaft 4, and the pair of third damping pads are arranged symmetrically about the central plane.

[0107] Please see Figure 2 , Figure 3 and Figure 5 As shown, the aforementioned handheld swing tool 100 also includes a counterweight 9 disposed on the inner housing, with the counterweight 9 and the output shaft 4 located on opposite sides of the eccentric shaft 31. In addition to the vibration damping unit 8 disposed between the outer housing 11 and the inner housing, an additional counterweight 9 is disposed on the inner housing to balance the vibration generated during operation of the handheld swing tool 100. This dual approach effectively reduces the overall vibration of the machine, thereby improving user comfort.

[0108] The working principle of counterweight 9 is as follows: (Ref) Figure 10 As shown, the vibration source of the handheld swing tool 100 is the area containing the eccentric portion 312 of the eccentric shaft 31, the eccentric bearing 32, and the pair of fork-shaped parts of the shift fork 33. The front side of this area houses a series of components such as the output shaft 4, locking mechanism 5, fastening element 6, operating wrench 7, and working element 101, and its overall weight is relatively large. Conversely, the rear side of this area houses the motor assembly 2, which has a smaller overall weight. With the vibration source as the fulcrum, the front area has a larger weight, while the rear area has a smaller weight. By setting a counterweight 9 in the rear area to balance the weight of the front area, it is beneficial to reduce the vibration generated by the handheld swing tool 100 during operation.

[0109] Furthermore, in the direction of the first axis L1 of the motor assembly 2, the distance between the counterweight 9 and the eccentric portion 312 is greater than the distance between the output shaft 4 and the eccentric portion 312. Because the front region extends a shorter distance in the direction of the first axis L1, the distance between the center of gravity of the front region and the vibration source is smaller, while the rear region extends a longer distance in the direction of the first axis L1, resulting in a larger distance between the center of gravity of the rear region and the vibration source. Similar to the principle of a seesaw, since the distances between the centers of gravity and the vibration source on both sides are different, by placing the counterweight 9 as far away from the eccentric portion 312 as possible, a smaller weight in the counterweight 9 can achieve a balancing effect, which helps reduce the overall weight of the machine.

[0110] In this embodiment, the counterweight 9 is disposed at the rear end of the motor housing 12, and further, the counterweight 9 is located on the rear side of the first vibration damping unit 81.

[0111] Furthermore, the counterweight 9 is configured as a weight-adding portion formed on the end cover 122, which protrudes from the end face of the cover 1221 away from the motor bracket 121. Preferably, the weight-adding portion and the end cover 122 are integrally constructed, thereby reducing the number of parts and lowering production and assembly costs.

[0112] Please see Figure 7 As shown, in an alternative embodiment, the counterweight 9' can also be a counterweight cover attached to the end cap 122. The shape of the counterweight cover matches the shape of the end cap 122, and the counterweight cover and the end cap 122 are separate structures, meaning they are detachably connected. Specifically, the motor housing 12 is made of metal, while the counterweight 9' is made of magnetic material. Therefore, the counterweight 9' can be magnetically and easily attracted and fixed to the motor housing 12 without requiring modification to the existing motor housing 12, and installation is extremely convenient.

[0113] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many other alternative solutions exist for the handheld swing tool of this utility model without departing from the principles and scope of this utility model. The scope of protection of this utility model is determined by the claims.

Claims

1. A hand-held oscillating tool adapted with a working element, the hand-held oscillating tool comprising a housing, a motor assembly mounted to the housing, a drive mechanism connected to the motor assembly, and an output shaft driven by the drive mechanism, the working element being fixed to the output shaft, the housing comprising an outer housing for a user to hold, a motor housing accommodating the motor assembly, and a head housing fixed to the motor housing, the head housing accommodating the drive mechanism and the output shaft; characterized in that: The handheld swing tool includes a first vibration damping unit connected between the outer housing and the motor housing, and a second vibration damping unit connected between the outer housing and the head housing. The hardness of the first vibration damping unit is higher than that of the second vibration damping unit.

2. The hand-held swing tool of claim 1, wherein: The ratio of the hardness of the second damping unit to that of the first damping unit is 0.3 to 0.

7.

3. The hand-held swing tool of claim 1, wherein: The first vibration damping unit is configured to separate the motor housing and the outer housing. The first vibration damping unit includes a pair of first vibration damping pads. The outer housing includes a mounting cavity formed on the inner wall. The first vibration damping pads are received in the mounting cavity and abut against the motor housing.

4. The hand-held swing tool of claim 3, wherein: The second vibration damping unit is configured to space the head shell and the outer casing apart. The second vibration damping unit includes a pair of second vibration damping pads. The outer casing includes a mounting cavity formed in the inner wall. The head shell includes a positioning post protruding from the outer surface. The second vibration damping pad includes a recessed positioning hole. The second vibration damping pad is received in the mounting cavity and is sleeved on the positioning post through the positioning hole.

5. The hand-held swing tool of claim 4, wherein: The second vibration damping unit includes a pair of third vibration damping pads, which are glued to the inner wall of the outer casing and abut against the head shell.

6. The hand-held swing tool of claim 5, wherein: The second and third vibration damping pads are arranged at intervals in the vertical direction.

7. A hand-held swing tool according to claim 6, characterized in that: A pair of second damping pads are arranged symmetrically about the axis of the motor assembly, and a pair of third damping pads are arranged symmetrically about the axis of the output shaft.

8. A hand-held swing tool according to claim 7, characterized in that: A pair of first damping pads are arranged symmetrically about the axis of the motor assembly, and the first damping pads are disposed on the side of the motor housing away from the head shell.

9. The hand-held swing tool of claim 8, wherein: The centers of the pair of first damping pads and the center of the pair of second damping pads are located on the same horizontal plane.

10. The handheld swing tool according to claim 8, characterized in that: The axis of the motor assembly is perpendicular to the axis of the output shaft, and the axis of the motor assembly and the axis of the output shaft together form a central plane. A pair of first damping pads, a pair of second damping pads, and a pair of third damping pads are all arranged symmetrically about the central plane.

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